Fabregas returns to Barcelona training
The former Arsenal captain was involved in part of Monday's session as Pep Guardiola's side prepared for Wednesday's Champions League Group H game against Czech club Viktoria Plzen, Barca said on their website.
The European champions have four points from two games, level with AC Milan. BATE Borisov of Belarus and Plzen are both on one point.
Barca also host Sevilla in La Liga on Saturday.